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Invisible QCD as Dark Energy
oleh: Andrea Addazi, Stephon Alexander, Antonino Marcianò
| Format: | Article |
|---|---|
| Diterbitkan: | MDPI AG 2020-05-01 |
Deskripsi
We account for the late time acceleration of the Universe by extending the Quantum Chromodynamics (QCD) color to a <inline-formula> <math display="inline"> <semantics> <mrow> <mi>S</mi> <mi>U</mi> <mo stretchy="false">(</mo> <mn>3</mn> <mo stretchy="false">)</mo> </mrow> </semantics> </math> </inline-formula> invisible sector (IQCD). If the Invisible Chiral symmetry is broken in the early universe, a condensate of dark pions (dpions) and dark gluons (dgluons) forms. The condensate naturally forms due to strong dynamics similar to the Nambu–Jona-Lasinio mechanism. As the Universe evolves from early times to present times the interaction energy between the dgluon and dpion condensate dominates with a negative pressure equation of state and causes late time acceleration. We conclude with a stability analysis of the coupled perturbations of the dark pions and dark gluons.